digital mobile radio systems

Ngày tải lên: 23/06/2014, 00:20

Ngày tải lên: 23/06/2014, 01:20

Ngày tải lên: 03/07/2014, 21:45

Ngày tải lên: 04/07/2014, 03:55

... links for the Mobile Satellite Systems 67 Figure 2.10 ORBCOMM network architecture. Mobile Satellite Communication Networks58 Figure 2.6 Inmarsat service coverage (courtesy of Inmarsat). Mobile Satellite ... The mobile- to -mobile call is delayed by Mobile Satellite Communication Networks48 Figure 2.3 Possible S-PCN architectures for global coverage. 2.2.4 Asia Cellular Satellite, THURAYA and Other Systems There ... are now a number of systems deployed that exploit geostationary satellites to provide mobile services at the L-band. These regionally deployed systems focus on providing mobile services to regions...

Ngày tải lên: 14/09/2012, 11:26

... UHF bands, for example, television, domestic radio, Citizens' Band radio, marine radio, aeromobile radio (including instrument landing systems) and military radio. Several of these services have ... therefore encompasses satellite mobile, aeromobile and maritime mobile, as well as cordless telephones, radio paging, traditional private mobile radio (PMR) and cellular systems. Any book which attempted ... unlikely that Marconi thought of this experiment in terms of mobile radio, mobile radio it certainly was. Nowadays the term `mobile radio& apos; is deemed to embrace almost any situation where...

Ngày tải lên: 28/10/2013, 11:15

... a major source of problems to mobile radio systems in temperate climates. REFERENCES 1. Jordan E.C. and Balmain K.G. (1968) Electromagnetic Waves and Radiating Systems. Prentice Hall, New York. 2.Friis ... where the signal strength will exceed a speci®ed level. In practice, mobile radio channels rank among the worst in terrestrial radio communications. The path loss often exceeds the free space or ... and therefore have the potential to cause interference between dierent radio communication systems. Forward scattering of radio energy is suciently dependable that it may be used as a mechanism...

Ngày tải lên: 07/11/2013, 03:15

... problem is further been divided into two parts. 44 Advances in Cognitive Radio Systems Advances in Cognitive Radio Systems 32 2.8 Underlay Control Messaging (UCM) This approach is the equivalent ... devices. ADVANCES IN COGNITIVE RADIO SYSTEMS Edited by Cheng-Xiang Wang and Joseph Mitola III 2 Control Plane for Spectrum Access and Mobility in Cognitive Radio Networks with Heterogeneous ... vol.2, no.2, April 2010, pp.159-163 Wideband Voltage Controlled Oscillators for Cognitive Radio Systems 5 behind this improvement lied in the fact that artificial transmission line (ATL)...

Ngày tải lên: 07/03/2014, 21:20

... such as an AM radio signal (Chapter 4). Other basic concepts that are focused on are spectrum, signal-to-noise ratio for analog systems, and probability of bit error for digital systems. Moreover, ... Telecommunications 569 8–2 Telephone Systems 570 Historical Basis, 570 Modern Telephone Systems and Remote Terminals, 571 8–3 Digital Subscriber Lines (DSL) 577 G.DMT and G.Lite Digital Subscriber Lines, ... Evaluation, 609 E b ͞N 0 Link Budget for Digital Systems, 612 Path Loss for Urban Wireless Environments, 613 8–7 Fiber-Optic Systems 618 8–8 Cellular Telephone Systems 620 First Generation (1G)—The...

Ngày tải lên: 05/04/2014, 12:54

... Cataloguing in Publication Data Guo, Y. Jay Advances in mobile radio access networks—(Artech House mobile communications library) 1. Mobile communications systems I. Title 621.3’845 ISBN 1-58053-727-8 Cover ... Figure 2.6 PA Consulting’s software radio- based WCDMA base station. TEAM LinG Advances in Mobile Radio Access Networks TEAM LinG TEAM LinG 62 Advances in Mobile Radio Access Networks half ... products. The interest in software radio has been mainly from mobile terminal vendors due to the fact that mobile terminals need to roam between different systems frequently. However, there...

Ngày tải lên: 18/04/2014, 10:43

... mobility. Four fundamental aspects of mobile work are mobile workers, mobile tasks, mobile context, and mobile tech- nology (Yuan & Zjeng, 2005). Examples of mobile workforces are sales- people ... categorise mobile services are described. 2.2 Categorisation of mobile services Mobile information services are a merger of Internet and mobile telecom- munication. Unlike the use of the mobile ... mo- bile auction or reverse auction, mobile entertainment services, mobile office, mobile distance education, wireless data centre and mobile music. You can use mobile services anyplace, anytime,...

Ngày tải lên: 25/05/2014, 09:22

... cognitive radio systems, ” IEEE Transactions on Wireless Communications,vol.8,no.10, pp. 5112–5123, 2009. [6] D. Chen, J. Li, and J. Ma, “In-band sensing without quiet period in cognitive radio, ” ... “Maximum-minimum eigenvalue detection for cognitive radio, ” in Proceedings of the 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC ’07), Athens, Greece, September ... Jeong, J. A. Han, G. Ko, and M. S. Song, “An efficient quiet period management scheme for cognitive radio systems, ” IEEE Transactions on Wireless Communications,vol. 7, no. 2, pp. 505–509, 2008. [4]S.S.Jeong,W.S.Jeon,andD.G.Jeong,“Dynamicchan- nel...

Ngày tải lên: 21/06/2014, 05:20

... “Fitness landscape analysis for resource allocation in multiuser OFDM based cog- nitive radio systems, ” ACM SIGMOBILE Mobile Computing and Communications Review, vol. 13, no. 2, pp. 26–36, 2009. [25] ... making software radios more personal,” IEEE Personal Communica- tions, vol. 6, no. 4, pp. 13–18, 1999. [3] J. Mitola, Cognitive Radio Architecture: The Engineering Foun- dations of Radio XML, Wiley-Interscience, ... 2009. [15] T. Qin and C. Leung, “Fair adaptive resource allocation for multiuser OFDM cognitive radio systems, ” in Proceedings of the 2nd International Conference on Communications and Networking...

Ngày tải lên: 21/06/2014, 11:20

... spectrum opportunities with MAC-layer sensing in cognitive radio networks,” IEEE Transactions on Mobile Computing, vol. 7, no. 5, pp. 533–545, 2008. [17] S. Haykin, “Cognitive radio: brain-empowered wireless com- munications,” ... “Sensing-throughput tradeoff in cognitive radio networks: how frequently should spectrum sensing be carried out?” in Proceedings of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications ... Probability Constraint in Cognitive Radio Systems Qinghai Xiao, 1, 2 Yunzhou Li, 1 Xiaofeng Zhong, 1 Xibin Xu, 1 and Jing Wang 1 1 State Key Laboratory on Microwave and Digital Communications, Tsing...

Ngày tải lên: 21/06/2014, 19:20

... standardizing (e.g., IEEE 802.22 [6, 7]) and implementing (e.g., XG radio system [8]) the cognitive radio. In a cognitive radio system, secondary users (without license) can use frequency channels ... sensing, which monitors the spectrum activity, is a key issue in cognitive radio systems, particularly in wideband systems which may contain multiple frequency channels. Due to hardware limitation ... which monitors the spectrum activity in multiple channels, is studied for multichannel cognitive radio systems with nonnegligible channel switching time (blind period). The spectrum sensor needs to...

Ngày tải lên: 21/06/2014, 20:20

Ngày tải lên: 22/06/2014, 19:20

... Journal on Embedded Systems Volume 2007, Article ID 47580, 22 pages doi:10.1155/2007/47580 Research Article A SystemC-Based Design Methodology for Digital Signal Processing Systems Christian Haubelt, ... heterogeneous embedded systems using symbolic search and multi-granular simulation,” in Pro- ceedings of the Joint Conference on Languages, Compilers and Tools for Embedded Systems: Software and ... for Em- bedded Systems, pp. 18–27, Berlin, Germany, June 2002. [15] V. Kianzad and S. S. Bhattacharyya, “CHARMED: a multi- objective co-synthesis framework for multi-mode embedded systems, ” in...

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 23/06/2014, 01:20

Ngày tải lên: 23/06/2014, 01:20